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Member postings for Paul Johnson 4

Here is a list of all the postings Paul Johnson 4 has made in our forums. Click on a thread name to jump to the thread.

Thread: Warbirds Replicas P51 Mustang
23/11/2020 17:56:17
Posted by Eric Robson on 23/11/2020 15:39:13:

Be patient Martian and get on with the Cat, I am itching to start on mine but I am going to finish the Seafury first . Progress is slow as I can't shake off this head cold I have had for over a week

That's no head cold it's new model fever...cheeky

23/11/2020 09:14:01

Hi Gordon,

That is a good motor, I have one in a slightly larger air frame. It is a bit physically bigger than the FMS one but will do the job, obviously you will have to check all the alignment of motor to cowl etc as you go. The motor also has a shaft which extends rearwards when you fit the prop adapter, this is removed using a dremel on mine. This will protrude into the battery box if you don't remove it. The FMS one does not have this shaft sticking out the back.

22/11/2020 18:23:23

HI Gordon,

Provided you follow the build and the manual you will have no problems. Just take your time, check it twice before you cut anything.

Anything you aren't sure of ask on here.

Edited By Paul Johnson 4 on 22/11/2020 18:24:56

22/11/2020 16:58:57
Posted by Glynn on 19/11/2020 22:19:54:

Those spinners are a work of Art.

Well I have met the 'Boys' on many an occasion but have never seen ART.... cousin?

Well while you lucky lads who have been sniffing the contents of your 'Labelled' boxes trying to find room on the cluttered workbench.

I have been slaving away trying to get the left wing to the same point as the right.

I have to finish lining the wheel well and then glue the wing tip on.

lw progress 1.jpg

The old lump of expanded polystyrene helps to lower the 'dings' in the sheeting.

Just had to take a couple more pictures of the flaps as they are really worth the time and effort .

lw flap1.jpg

I mean come on guys don't they look sexy....!

lw flap2.jpg

17/11/2020 18:37:51

I can see Nigel right now... laughing like Dick Dastardly's dog Muttly.

17/11/2020 18:24:32

Damn it guys will you lot shuddup about box labels...

Rolled plans.... box labels... na nany na na...

16/11/2020 12:33:34

Look out... Richard's loose with a hammer..!

15/11/2020 15:56:54

Offered up the two wing halves and found you will need to trim the lower spar to aid assembly other wise it fouls on the skin.

main spare trim.jpg

15/11/2020 13:35:26

Hey now Kickapoo would have been just right...

Renown for kicking the shite out of the enemy ...

14/11/2020 21:22:26


Hey you may be lagging but your still one of the gang...

All pee taking greatfully accepted...

14/11/2020 19:37:23
Posted by Graham R on 14/11/2020 19:35:32:

I have a spare Ripmax Quantum 55 700kv which I am planning to use in mine.

On a 14x8x4...?

14/11/2020 19:34:43

Oh it's one of Richard's kits from long ago.....devil

Really good model guys.....

He he he he'll slap my wrist for that one...

14/11/2020 19:30:33

Da Rat......


14/11/2020 19:23:12

Hi Geoff,

I think you will find even on 4 cell the current draw will be too high.

Don't know what the motor specs are.

I use a 13x7.5x3 on a 650kv with a 4 cell that pulls nearly 50 amps full throttle. This is in my Yak3. Like a rat up a drain pipe but with a 4 cell 3300mah 4 mins is your limit and that's being careful with the throttle, usually 60 to 75 percent.

If you have a ammeter/power meter try some static tests. This can be a little misleading as the motor usually unloads somewhat in flight so okay for a initial try.

Using a 5 cell with a 660kv could be over stressing the blades.

There has occasional blade separation where the 'speed' freaks push them too far.

14/11/2020 17:50:32

Motor selection...

Although thoroughly covered elsewhere in these threads, to save you looking, the standard motor for the FMS 1400 P51 is a KV540.

The first 'mod' for a little more speed was to put a 1mm section of a zip tie under the leading edge of the prop between the backplate and prop. The next upgrade was to change to the KV580 motor.

I have tried both these 'upgrades' and found the KV580 a better option.

Downside is flight time, I like to fly 'scale isn't and very rarely am full throttle. On the 540 could get a good 8 mins out of a 4000mah 4 cell.

Lost 2 mins with the zip tie mod and down to 5 with the 580

All using the 14x8x4 fms prop.

Hope you find it useful.



Edited By Paul Johnson 4 on 14/11/2020 17:53:07

14/11/2020 14:44:31

Hey everyone noticed Nigel has gone quiet...... Mrs must have read his posts.....

Finished sheeting top of second wing... just started on the bottom.

14/11/2020 13:38:05

The 17x9 is on the 1700 fms model and I think uses a 380kv motor on 6 cell.

14/11/2020 12:18:13

That's what I am using..

13/11/2020 15:41:02
Posted by Nigel Dell on 12/11/2020 22:11:35:

Paul I like to live on the ragged edge🤣

Rich I have tried that but to no avail, something to do with the condenser I think😈😂 come to think about it she reminds me of your Kwacker starting up 🤭👍🏻😂

Give that man the DFC and Bar (well at least a pint) for outstanding bravery.

Meanwhile, I am working my way towards assembly of the opposite wing so talk amongst yourselves for a while...

12/11/2020 22:07:03

Ooohhh bet she hasn't seen that post....

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